DE4134365C2 - Device for quick clamping of printing plates - Google Patents

Description

The invention relates to a device for precise, quick clamping of flexible Printing plates on the plate cylinders of sheet-fed rotary printing machines. To achieve a register-accurate print, it is necessary that the pressure plate in its position on the Plate cylinder is arranged to be correctable.

It is a device for clamping flexible printing plates on a cylinder in rotary printing presses known (DE 36 04 209 C2, B41F 13/16), with Schiefla correction of the printing plate the printing plate when the printing machine is at a standstill via control curves relaxed and rotated around a pivot point. After turning the print plate is clamped again with the help of the clamping device.

The disadvantage here is that the device consists of a variety of elements and there is very complicated, prone to failure and inaccurate as well as during the adjustment of the Pressure plate a firm clamping is not guaranteed, the adjustment during Ma must standstill. This is not a defined movement of the pressure plate more guaranteed and there may be unwanted register deviations after the skew adjust correction. The gear used and its arrangement for movement and Connection of the two tensioning rails causes only an approximate movement of the Pressure plate around the pivot point of the pressure plate and therefore leads to tension and Register errors.  

DE 37 31 684 A1 describes a device for mounting a printing plate on an egg NEN plate cylinder of a rotary printing press known, in which be in over springs spaced clamping strips, there is a pressure plate on the plate cylinder by displaceable and interlocking, that each tensioning strip is assigned an actuating shaft is, which has a number of truncated cones, viewed in the axial direction, the Ke Gel stumps are arranged eccentrically to the axes of the control shafts. The tension bars have a number of plungers, by means of which they directly on the truncated cones of the Support adjusting shafts. Both control shafts can be swiveled and one control shaft is additional axially displaceable.

With this device, adjustment is also only possible when the machine is at a standstill. There is also a defined adjustment of the pressure plate in the event of a skew correction not possible.

Based on this state of the art, it is the task the invention, a device for quick clamping of To create printing plates that are simple and accurate Skew correction of the pressure plate during start-up guaranteed by remote-controlled means, as well as a defi nated movement of the pressure plate during the skewed position correction when the pressure plate is firmly clamped in the clamp direction guaranteed.

According to the invention, the object is achieved in that the front tensioning rail and the rear tensioning rail around the in the center of the cylinder channel of the front clamping rail neten pivot point to one over one during Ma Schinenlaufs operated actuator swivel bar and arranged for parallel guidance via two handlebars and for almost axial displacement the rear lower rail to the cylinder axis and counter the direction of rotation of the front bottom rail via an Angle lever and cylinder cylinder base rotatably fastened a coupling are hinged together, the rear tensioning rail with tensioning screws one with the Actuator for the central tension in connection standing and provided with several locking sections Wedge is assigned, and the front tensioning rail over Tensioning screws are assigned to the front lower rail as well as the one with a stepper motor and one with a groove curve connected gear motor existing actuation Setting up the front lower rail via one with one End guided in the groove curve and with the other end engage in an opening in the bottom rail the eccentric roller lever is assigned.  

The advantages of the inventive solution are that the existing elements of the quick release device with ge used with little effort and without additional space can be. Another advantage is the pressure plate not uncontrolled during the correction process movements and the pressure plate on the back end is only relaxed to such an extent that the Pressure plate is made possible without the clamping device open at the front and rear edge of the pressure plate will. By swiveling the front and back together tere clamping device is a tensioning of the pressure plate and thus misregistration avoided. Another advantage is that the skew correction during the start he follows.

Embodiment

An embodiment of the invention is in the drawings gene and described in more detail below.

Show it

Fig. 1: a plan view

Fig. 2 is a sectional view of Figure 1.

In Fig. 1 a plan view is shown on a plate cylinder 1, a Zentralklemm- and -spanneinrichtung 3 is arranged in the cylinder channel 2. The central clamping and clamping device 3 consists of a clamping rail 4 and a clamping device 5 , each of the front 6.1 and rear end 6.2 of a plate 6 arranged on the plate cylinder 1 and shown in Fig. 2 are assigned.

The tensioning device 5 is composed of a front tensioning rail 5.1 which is fastened on a front bottom rail 5.2 which can be pivoted about a pivot point 21 and a rear tensioning rail 5.3 which is arranged displaceably on a pivotable bottom rail 5.4 .

The lower rails 5.2 and 5.4 are connected to each other via two links 7 of equal length, so that there is always parallel guidance of the lower rails 5.2 and 5.4 .

At the same time, the lower rails 5.2 and 5.4 are connected in an articulated manner to an angular lever 8 rotatably mounted in the cylinder channel base 2.1 , a coupling 9 , a straight guide 10 and a bolt 11 on the rear lower rail 5.4 .

The tensioning screws 12 assigned to the rear tensioning rail 5.3 rest against a drawing wedge 14 with an en de.

The pull wedge 14 is mounted between the clamping screws 12 and the lower rail 5.4 and is provided with a plurality of latching sections 15 in the area of the clamping screws 12 . The latching sections 15 are composed of an upper latch 15.1 , a middle latch 15.2 and a lower latch 15.3 . At the ends of the drawing wedge 14 rollers 18 are brought, which are arranged on the machine frame 19 arranged adjusting device 20 for the Zen tralspannen.

The front clamping device 5 is in the center a fixedly arranged in the cylinder channel 2 pivot point 21 and laterally an actuator 22 attached to the machine frame 19 .

The actuating device 22 shown in FIG. 2 is associated with one side of the machine frame 19 and engages with the other side via an eccentric 27 arranged on a roller lever 26 in an opening 28 of the front lower rail 5.2 .

FIG. 2 shows a sectional illustration of the device for precise quick clamping according to FIG. 1.

In the cylinder channel 2 of the plate cylinder 1 , the clamping device 5 with a front rail Ren 5.1 5.1 , which is arranged on a rotatable about the pivot point 21 lower rail 5.2 and a rear clamping rail 5.3 , which is attached to the pivotable lower rail 5.4 , is arranged.

The rotatable lower rail 5.2 is operatively connected to the actuating device 22 . The actuating device consists of a step motor 23 fastened to the machine frame, a geared motor 24 connected to the groove curve 25 and the roller lever 26 which periodically engages with the groove curve 25 at one end and is assigned with the other end of the lower rail 5.2 .

The assignment of the roller lever 26 to the lower rail 5.2 shown in FIG. 1 takes place via the eccentric 27 , which engages in an opening 28 of the lower rail 5.2 . To Lagesi assurance the roller lever 26 is assigned a brake.

The device for rapid clamping of a printing plate 6 , with which the printing plate 6 can be skewed at the same time, functions as follows.

After determining the necessary manipulated variable for the skew correction, the plate cylinder 1 is slowly rotated during the start-up and the actuating device 20 is brought into such a position that the clamping screws 12 are located on the middle catch 15.2 of the pulling wedge 4 and the pressure plate 6 is thereby relaxed slightly , so that the pressure plate 6 can be rotated. Subsequently, the roller lever 26 and thus the crowned out in the opening 28 of the lower rail 5.2 engaging the eccentric 27 is rotated via the second actuating device 22 , whereby the rotation of the pressure plate 6 around the pivot point 21 is effected. Here, a parallel guidance of the lower rails 5.2 ; is arranged between the lower rails 5.2 and 5.4 Len ker 7 . 5.4 reached about the pivot point 21 . Simultaneously, the rear sub-rail 5.4 on the rotatably mounted in the cylinder channel base 2.1 the coupling 9, the angular lever 8 and the Geradfüh tion approximately 9.1 displaced axially to the cylinder axis 2.2. After the correction, the roller lever 26 is secured in its position by the brake 29 .

By turning the plate cylinder 1 further, the adjusting device 20 for the central clamping is brought into such a position that when the pulling wedge 14 is turned past the pressure plate 6 again clamps on the upper catch 15.1 .

Reference list

1

Plate cylinder

2nd

Cylinder channel

2.1

Cylinder channel base

2.2

Cylinder axis

3rd

Central clamping and clamping device

4th

Clamping rail

5

Clamping device

5.1

front tensioning rail

5.2

front lower rail

5.3

rear tensioning rail

5.4

Bottom rail

6

printing plate

6.1

front pressure plate end

6.2

rear pressure plate end

7

Handlebars

8th

Angle lever

9

Paddock

9.1

Straight guidance

10th

bolt

12th

Clamping screw

13

Central clamping device

14

Drawing wedge

15

Rest section

15.1

upper rest

15.2

medium rest

15.3

lower rest

18th

role

19th

Machine frame

20th

Actuator

21

pivot point

22

Actuator

23

Stepper motor

24th

Gear motor

25th

Groove curve

26

Roller lever

27

eccentric

28

Opening

29

brake

Claims (4)

1.Device for precise positioning of a flexible printing plate on the plate cylinder of sheet-fed rotary offset printing presses with central clamping and clamping devices arranged in the cylinder channel and a device for rotating the printing plate around a pivot point, characterized in that the front clamping rail ( 5.1 ) and the rear tensioning rail ( 5.3 ) is arranged around the center of rotation ( 21 ) assigned to the center of the front tensioning rail ( 5.2 ) in the cylinder channel ( 2 ) on a respective bottom rail ( 5.2 ; 5.4 ) that can be pivoted via an actuating device ( 22 ) that can be operated while the machine is running and parallel Guidance via two links ( 7 ) and for the almost axial displacement of the rear lower rail ( 5.4 ) to the cylinder axis ( 22 ) and against the direction of rotation of the front lower rail ( 5.2 ) via an angled lever ( 8 ) on the cylinder channel base ( 2.1 ) and a coupling ( 9 ) articulated with each other are bound. 2. Device according to claim 1, characterized in that the rear clamping rail ( 5.3 ) via clamping screws ( 12 ) egg nem associated with the adjusting device ( 20 ) for the central tension and associated with several locking sections ( 15 ) pulling wedge ( 14 ) . 3. Device according to claim 1, characterized in that the front clamping rail ( 5.1 ) via clamping screws ( 12 ) is assigned to the front lower rail ( 5.2 ). 4. Device according to claim 1, characterized in that consisting of a stepper motor ( 23 ) and with a Nutkur ve ( 25 ) connected gear motor ( 24 ) existing actuation device ( 22 ) of the front lower rail ( 5.2 ) via one with one end in the groove curve ( 25 ) guided and with the other end via an engaging in an opening ( 28 ) of the lower rail ( 5.2 ) engaging eccentric ( 27 ) is provided with a roller lever ( 26 ).